支持评论级联软删与后台回收站，并完善 Markdown 代码围栏嵌套。

Co-authored-by: Cursor <cursoragent@cursor.com>

frontend/src/api/client.ts

@@ -215,6 +215,22 @@ export const api = {
       method: 'POST', body: JSON.stringify({ reason: reason || '' }),
     }),
   adminDeleteComment: (id: number) => request(`/api/admin/comments/${id}`, { method: 'DELETE' }),
+  adminTrashComments: (params?: { page?: number; keyword?: string }) => {
+    const q = new URLSearchParams();
+    if (params?.page) q.set('page', String(params.page));
+    if (params?.keyword) q.set('keyword', params.keyword);
+    const qs = q.toString();
+    return request<{
+      comments: (Comment & { deleted_at: string })[];
+      total: number;
+      page: number;
+      total_pages: number;
+    }>(`/api/admin/comments/trash${qs ? `?${qs}` : ''}`);
+  },
+  adminRestoreComment: (id: number) =>
+    request<{ message: string }>(`/api/admin/comments/${id}/restore`, { method: 'POST' }),
+  adminPurgeComment: (id: number) =>
+    request<{ message: string }>(`/api/admin/comments/${id}/purge`, { method: 'DELETE' }),
   adminCommentRevisions: (id: number) =>
     request<{ revisions: CommentRevision[] }>(`/api/admin/comments/${id}/revisions`),
   adminUsers: (page = 1, opts?: { keyword?: string; filter?: string }) => {

frontend/src/components/ArticleEditor.tsx

@@ -50,6 +50,7 @@ import {
   formatFenceInfo,
   type CodeBlockInsertOptions,
 } from '../utils/codeBlockOptions';
+import { fenceLengthForContent } from '../utils/markdownFences';
 import { Tooltip } from './ui/Tooltip';
 
 export interface ArticleEditorHandle {
@@ -85,8 +86,9 @@ const REPLY_ONLY_PLACEHOLDER = '在此输入回复后可见的内容…';
 /** 按选项生成 Markdown 侧插入片段（围栏 meta，便于手写） */
 function buildMarkdownCodeBlockSnippet(opts: CodeBlockInsertOptions, body = '代码'): string {
   const info = formatFenceInfo(opts);
-  const fence = info ? `\`\`\`${info}` : '```';
+  const fence = '`'.repeat(fenceLengthForContent(body));
-  return `\n${fence}\n${body}\n\`\`\`\n`;
+  const open = info ? `${fence}${info}` : fence;
+  return `\n${open}\n${body}\n${fence}\n`;
 }
 
 /** 生成 GFM 管道表；源码侧始终带表头分隔行 */

frontend/src/components/CommentThreadList.tsx

@@ -368,7 +368,9 @@ function CommentItem({
               <AlertDialogContent>
                 <AlertDialogHeader>
                   <AlertDialogTitle>确定删除该评论？</AlertDialogTitle>
-                  <AlertDialogDescription>删除后不可恢复。</AlertDialogDescription>
+                  <AlertDialogDescription>
+                    将同时移入回收站其下所有回复，可在后台恢复或永久删除。
+                  </AlertDialogDescription>
                 </AlertDialogHeader>
                 <AlertDialogFooter>
                   <AlertDialogCancel>取消</AlertDialogCancel>

frontend/src/pages/PostDetailPage.tsx

@@ -45,6 +45,7 @@ import { useAuth } from '../hooks/useAuth';
 import { joinSEOKeywords, usePageSEO } from '../hooks/usePageSEO';
 import { getCachedSiteBranding } from '../hooks/useSiteBranding';
 import { formatDateTime, isTimeDiffSignificant } from '../utils/content';
+import { collectCommentSubtreeIds } from '../utils/comment';
 import { loadMyCommentIds } from '../utils/guest';
 import { clearAllFeedCache } from '../utils/feedCache';
 import { useGlobalWheelScroll } from '../hooks/useGlobalWheelScroll';
@@ -395,10 +396,11 @@ export default function PostDetailPage() {
   const handleDeleteComment = async (comment: Comment) => {
     try {
       await api.deleteComment(comment.id);
-      setComments(list => list.filter(c => c.id !== comment.id));
+      const removeIds = collectCommentSubtreeIds(comments, comment.id);
-      if (replyTo?.id === comment.id) setReplyTo(null);
+      setComments(list => list.filter(c => !removeIds.has(c.id)));
-      if (editingCommentId === comment.id) setEditingCommentId(null);
+      if (replyTo && removeIds.has(replyTo.id)) setReplyTo(null);
-      notify.success('评论已删除');
+      if (editingCommentId != null && removeIds.has(editingCommentId)) setEditingCommentId(null);
+      notify.success('评论已移入回收站');
     } catch (e: unknown) {
       notify.error(e instanceof Error ? e.message : '删除失败');
       throw e;

frontend/src/pages/admin/AdminCommentsPage.tsx

@@ -1,5 +1,6 @@
 import { useEffect, useState } from 'react';
 import { useNavigate } from 'react-router-dom';
+import { Trash2, RotateCcw } from 'lucide-react';
 import { Button } from '@/components/ui/button';
 import { Badge } from '@/components/ui/badge';
 import { Spinner } from '@/components/ui/spinner';
@@ -16,7 +17,8 @@ import type { Comment } from '../../api/types';
 import CommentRevisionDialog from '../../components/CommentRevisionDialog';
 import { isTimeDiffSignificant } from '../../utils/content';
 
-type Tab = 'pending' | 'all';
+type Tab = 'pending' | 'all' | 'trash';
+type TrashComment = Comment & { deleted_at: string };
 
 function statusLabel(status?: string) {
   switch (status) {
@@ -27,18 +29,28 @@ function statusLabel(status?: string) {
   }
 }
 
+function formatAdminTime(iso: string) {
+  const d = new Date(iso);
+  if (Number.isNaN(d.getTime())) return iso;
+  return d.toLocaleString('zh-CN', {
+    year: 'numeric', month: '2-digit', day: '2-digit',
+    hour: '2-digit', minute: '2-digit',
+  });
+}
+
 export default function AdminCommentsPage() {
   const nav = useNavigate();
   const { ready } = useAdminGuard();
   const [tab, setTab] = useState<Tab>('pending');
   const [comments, setComments] = useState<Comment[]>([]);
+  const [trash, setTrash] = useState<TrashComment[]>([]);
   const [loading, setLoading] = useState(true);
   const [page, setPage] = useState(1);
   const [totalPages, setTotalPages] = useState(1);
   const [pendingCount, setPendingCount] = useState(0);
   const [revComment, setRevComment] = useState<Comment | null>(null);
 
-  const load = (p = page, st: Tab = tab) => {
+  const loadList = (p = page, st: Tab = tab) => {
     setLoading(true);
     api.adminComments({ page: p, status: st === 'pending' ? 'pending' : 'all' })
       .then(d => {
@@ -51,6 +63,28 @@ export default function AdminCommentsPage() {
       .finally(() => setLoading(false));
   };
 
+  const loadTrash = (p = page) => {
+    setLoading(true);
+    api.adminTrashComments({ page: p })
+      .then(d => {
+        setTrash(d.comments ?? []);
+        setPage(d.page);
+        setTotalPages(d.total_pages);
+      })
+      .catch(e => notify.error(e.message))
+      .finally(() => setLoading(false));
+  };
+
+  const load = (p = page, st: Tab = tab) => {
+    if (st === 'trash') loadTrash(p);
+    else loadList(p, st);
+  };
+
+  const switchTab = (next: Tab) => {
+    setTab(next);
+    setPage(1);
+  };
+
   useEffect(() => {
     if (ready) load(1, tab);
     // eslint-disable-next-line react-hooks/exhaustive-deps
@@ -81,42 +115,141 @@ export default function AdminCommentsPage() {
   const remove = async (id: number) => {
     try {
       await api.adminDeleteComment(id);
-      notify.success('评论已删除');
+      notify.success('评论已移入回收站');
       load();
     } catch (e: unknown) {
       notify.error(e instanceof Error ? e.message : '删除失败');
     }
   };
 
+  const restore = async (id: number) => {
+    try {
+      await api.adminRestoreComment(id);
+      notify.success('评论已恢复');
+      loadTrash(page);
+    } catch (e: unknown) {
+      notify.error(e instanceof Error ? e.message : '恢复失败');
+    }
+  };
+
+  const purge = async (id: number) => {
+    try {
+      await api.adminPurgeComment(id);
+      notify.success('评论已永久删除');
+      loadTrash(page);
+    } catch (e: unknown) {
+      notify.error(e instanceof Error ? e.message : '永久删除失败');
+    }
+  };
+
   if (!ready) return null;
 
   return (
     <div className="admin-page">
       <div className="admin-page-head">
         <h1>评论管理</h1>
-        <p>审核普通用户评论；通过后公开，拒绝后仅作者可见并私信通知。</p>
+        <p>
+          {tab === 'trash'
+            ? '回收站中的评论可恢复或永久删除；永久删除后不可撤销'
+            : '审核普通用户评论；通过后公开，拒绝后仅作者可见并私信通知。删除将移入回收站。'}
+        </p>
       </div>
 
       <div className="admin-tabs" role="tablist">
         <button
           type="button"
           className={cn('admin-tab', tab === 'pending' && 'active')}
-          onClick={() => setTab('pending')}
+          onClick={() => switchTab('pending')}
         >
           待审核{pendingCount > 0 ? ` (${pendingCount})` : ''}
         </button>
         <button
           type="button"
           className={cn('admin-tab', tab === 'all' && 'active')}
-          onClick={() => setTab('all')}
+          onClick={() => switchTab('all')}
         >
           全部评论
         </button>
+        <button
+          type="button"
+          aria-selected={tab === 'trash'}
+          className={cn('admin-tab', tab === 'trash' && 'active')}
+          onClick={() => switchTab('trash')}
+        >
+          <Trash2 size={14} aria-hidden />
+          回收站
+        </button>
       </div>
 
       <div className="admin-card">
         {loading ? (
           <div className="flex justify-center py-12"><Spinner size="lg" /></div>
+        ) : tab === 'trash' ? (
+          <>
+            <table className="admin-table">
+              <thead>
+                <tr>
+                  <th>ID</th>
+                  <th>楼层</th>
+                  <th>帖子</th>
+                  <th>作者</th>
+                  <th>内容</th>
+                  <th>删除时间</th>
+                  <th>操作</th>
+                </tr>
+              </thead>
+              <tbody>
+                {trash.map(c => (
+                  <tr key={c.id}>
+                    <td>{c.id}</td>
+                    <td>#{c.floor}</td>
+                    <td>
+                      <button type="button" className="admin-text-link" onClick={() => nav(`/post/${c.post_id}`)}>
+                        {c.post?.title ?? `#${c.post_id}`}
+                      </button>
+                    </td>
+                    <td>
+                      {c.user_id && c.user ? c.user.nickname : (c.guest_nick || '游客')}
+                    </td>
+                    <td className="max-w-[200px] truncate">{c.content}</td>
+                    <td className="text-sm whitespace-nowrap">{formatAdminTime(c.deleted_at)}</td>
+                    <td>
+                      <div className="flex gap-1">
+                        <Button size="sm" variant="outline" onClick={() => restore(c.id)}>
+                          <RotateCcw size={14} /> 恢复
+                        </Button>
+                        <AlertDialog>
+                          <AlertDialogTrigger asChild>
+                            <Button size="sm" variant="ghost" className="text-destructive">永久删除</Button>
+                          </AlertDialogTrigger>
+                          <AlertDialogContent>
+                            <AlertDialogHeader>
+                              <AlertDialogTitle>永久删除该评论？</AlertDialogTitle>
+                              <AlertDialogDescription>
+                                将彻底清除该评论及其已删回复、修订与点赞，此操作不可恢复。
+                              </AlertDialogDescription>
+                            </AlertDialogHeader>
+                            <AlertDialogFooter>
+                              <AlertDialogCancel>取消</AlertDialogCancel>
+                              <AlertDialogAction onClick={() => purge(c.id)}>永久删除</AlertDialogAction>
+                            </AlertDialogFooter>
+                          </AlertDialogContent>
+                        </AlertDialog>
+                      </div>
+                    </td>
+                  </tr>
+                ))}
+              </tbody>
+            </table>
+            {trash.length === 0 && <div className="admin-empty">回收站为空</div>}
+            {totalPages > 1 && (
+              <div className="admin-pagination">
+                <Button size="sm" variant="outline" disabled={page <= 1} onClick={() => loadTrash(page - 1)}>上一页</Button>
+                <span>{page} / {totalPages}</span>
+                <Button size="sm" variant="outline" disabled={page >= totalPages} onClick={() => loadTrash(page + 1)}>下一页</Button>
+              </div>
+            )}
+          </>
         ) : (
           <>
             <table className="admin-table">
@@ -157,7 +290,7 @@ export default function AdminCommentsPage() {
                       </Badge>
                     </td>
                     <td>{c.is_private ? <Badge variant="secondary">是</Badge> : '—'}</td>
-                    <td>{new Date(c.created_at).toLocaleString('zh-CN')}</td>
+                    <td>{formatAdminTime(c.created_at)}</td>
                     <td>
                       <div className="flex gap-1 flex-wrap">
                         {(c.status === 'pending' || c.status === 'rejected') && (
@@ -175,12 +308,14 @@ export default function AdminCommentsPage() {
                           </AlertDialogTrigger>
                           <AlertDialogContent>
                             <AlertDialogHeader>
-                              <AlertDialogTitle>确定删除该评论？</AlertDialogTitle>
+                              <AlertDialogTitle>移入回收站？</AlertDialogTitle>
-                              <AlertDialogDescription>删除后不可恢复。</AlertDialogDescription>
+                              <AlertDialogDescription>
+                                将同时移入其下所有回复，可随时恢复；永久删除请到回收站操作。
+                              </AlertDialogDescription>
                             </AlertDialogHeader>
                             <AlertDialogFooter>
                               <AlertDialogCancel>取消</AlertDialogCancel>
-                              <AlertDialogAction onClick={() => remove(c.id)}>删除</AlertDialogAction>
+                              <AlertDialogAction onClick={() => remove(c.id)}>移入回收站</AlertDialogAction>
                             </AlertDialogFooter>
                           </AlertDialogContent>
                         </AlertDialog>

frontend/src/utils/comment.ts

@@ -22,6 +22,22 @@ export function isGuestComment(c: Comment): boolean {
   return !c.user_id || c.user_id === 0;
 }
 
+/** 收集评论及其 reply_to 后代的 ID（含自身） */
+export function collectCommentSubtreeIds(comments: Comment[], rootId: number): Set<number> {
+  const ids = new Set<number>([rootId]);
+  let changed = true;
+  while (changed) {
+    changed = false;
+    for (const c of comments) {
+      if (!ids.has(c.id) && c.reply_to != null && ids.has(c.reply_to)) {
+        ids.add(c.id);
+        changed = true;
+      }
+    }
+  }
+  return ids;
+}
+
 /** 构建嵌套评论树（优先 thread_parent_id，回退 reply_to） */
 export function buildCommentTree(comments: Comment[]): CommentNode[] {
   const map = new Map<number, CommentNode>();

frontend/src/utils/enhanceCodeBlocks.ts

@@ -40,9 +40,47 @@ function readDisplayOptions(pre: Element) {
   };
 }
 
+/**
+ * 在换行处闭合并重开跨行 <span>，使每行 HTML 片段自包含。
+ * hljs token 常跨多行，直接按 \\n 切开会破坏标签导致行号布局叠字。
+ */
+function balanceHighlightLines(highlightedHtml: string): string[] {
+  const openTags: string[] = [];
+  let balanced = '';
+  const tokenRe = /(<span\b[^>]*>)|(<\/span>)|(\n)/g;
+  let lastIndex = 0;
+  let match: RegExpExecArray | null;
+
+  while ((match = tokenRe.exec(highlightedHtml)) !== null) {
+    balanced += highlightedHtml.slice(lastIndex, match.index);
+    lastIndex = tokenRe.lastIndex;
+
+    if (match[3] !== undefined) {
+      // 换行：先闭合当前栈，再于下一行重开
+      for (let i = openTags.length - 1; i >= 0; i--) balanced += '</span>';
+      balanced += '\n';
+      for (const tag of openTags) balanced += tag;
+      continue;
+    }
+
+    if (match[2] !== undefined) {
+      openTags.pop();
+      balanced += match[2];
+      continue;
+    }
+
+    // 开标签
+    openTags.push(match[1]);
+    balanced += match[1];
+  }
+
+  balanced += highlightedHtml.slice(lastIndex);
+  return balanced.split('\n');
+}
+
 /** 为高亮后的 HTML 按行包一层，便于行号与折叠计数 */
 function wrapCodeLines(highlightedHtml: string, withLineNumbers: boolean): string {
-  const lines = highlightedHtml.split('\n');
+  const lines = balanceHighlightLines(highlightedHtml);
   return lines
     .map((line, i) => {
       const num = i + 1;

frontend/src/utils/markdownContent.ts

@@ -3,6 +3,7 @@ import { marked } from 'marked';
 import DOMPurify from 'dompurify';
 import { POST_CONTENT_PURIFY_CONFIG } from './postContent';
 import { parseFenceInfo, formatFenceInfo } from './codeBlockOptions';
+import { mapOutsideFences, wrapFencedCode } from './markdownFences';
 
 const GATED_BLOCK_RE = /<(members-only|reply-only)(?:\s[^>]*)?>([\s\S]*?)<\/\1>/gi;
 
@@ -80,7 +81,7 @@ function addTurndownContentRules(service: TurndownService): void {
       const collapsed = pre.getAttribute('data-collapsed') === 'true'
         || wrap?.getAttribute('data-collapsed') === 'true';
       const info = formatFenceInfo({ language, lineNumbers, collapsed });
-      return `\n\n\`\`\`${info}\n${text}\n\`\`\`\n\n`;
+      return wrapFencedCode(info, text);
     },
   });
 
@@ -284,10 +285,9 @@ function sanitizeContentHtml(html: string): string {
 
 /** 将行首空格转为不换行空格，避免 HTML 折叠缩进；跳过围栏代码块 */
 function preserveLeadingIndent(markdown: string): string {
-  return markdown.split(/(```[\s\S]*?```)/g).map((part, index) => {
+  return mapOutsideFences(markdown, (outside) =>
-    if (index % 2 === 1) return part;
+    outside.replace(/^( +)(?=\S)/gm, (_match, spaces: string) => '\u00A0'.repeat(spaces.length)),
-    return part.replace(/^( +)(?=\S)/gm, (_match, spaces: string) => '\u00A0'.repeat(spaces.length));
+  );
-  }).join('');
 }
 
 /** 将普通 Markdown 片段转为 HTML */

frontend/src/utils/markdownFences.ts

@@ -0,0 +1,73 @@
+/** CommonMark 围栏：开围栏行（最多 3 空格缩进 + 至少 3 个反引号） */
+const OPEN_FENCE_RE = /^ {0,3}(`{3,})([^`\n]*)$/;
+/** 闭围栏行：仅反引号与可选尾随空白 */
+const CLOSE_FENCE_RE = /^ {0,3}(`{3,})[ \t]*$/;
+
+/** 正文中最长连续反引号数；外层围栏需至少 longest+1（且 ≥ 3） */
+export function fenceLengthForContent(text: string): number {
+  let longest = 0;
+  let run = 0;
+  for (let i = 0; i < text.length; i++) {
+    if (text[i] === '`') {
+      run += 1;
+      if (run > longest) longest = run;
+    } else {
+      run = 0;
+    }
+  }
+  return Math.max(3, longest + 1);
+}
+
+/** 用足够长的围栏包裹代码正文（info 为语言/选项串，可为空） */
+export function wrapFencedCode(info: string, text: string): string {
+  const len = fenceLengthForContent(text);
+  const fence = '`'.repeat(len);
+  const open = info ? `${fence}${info}` : fence;
+  return `\n\n${open}\n${text}\n${fence}\n\n`;
+}
+
+/**
+ * 按行识别围栏块；仅对围栏外文本调用 fn。
+ * 闭合条件：行首闭围栏长度 ≥ 开围栏（CommonMark）。
+ */
+export function mapOutsideFences(markdown: string, fn: (outside: string) => string): string {
+  const lines = markdown.split('\n');
+  const out: string[] = [];
+  let i = 0;
+  let outsideBuf: string[] = [];
+
+  const flushOutside = () => {
+    if (outsideBuf.length === 0) return;
+    out.push(fn(outsideBuf.join('\n')));
+    outsideBuf = [];
+  };
+
+  while (i < lines.length) {
+    const openMatch = lines[i].match(OPEN_FENCE_RE);
+    if (!openMatch) {
+      outsideBuf.push(lines[i]);
+      i += 1;
+      continue;
+    }
+
+    flushOutside();
+    const openLen = openMatch[1].length;
+    const fenceLines = [lines[i]];
+    i += 1;
+
+    while (i < lines.length) {
+      fenceLines.push(lines[i]);
+      const closeMatch = lines[i].match(CLOSE_FENCE_RE);
+      if (closeMatch && closeMatch[1].length >= openLen) {
+        i += 1;
+        break;
+      }
+      i += 1;
+    }
+
+    out.push(fenceLines.join('\n'));
+  }
+
+  flushOutside();
+  return out.join('\n');
+}

handler/api.go

@@ -365,14 +365,53 @@ func (h *Handlers) APIAdminRejectComment(c *gin.Context) {
 	c.JSON(http.StatusOK, gin.H{"message": "已拒绝该评论并通知作者", "status": model.ContentStatusRejected})
 }
 
-// APIAdminDeleteComment 管理员删除评论
+// APIAdminDeleteComment 管理员软删除评论（进入回收站）
 func (h *Handlers) APIAdminDeleteComment(c *gin.Context) {
 	id, _ := strconv.ParseUint(c.Param("id"), 10, 64)
 	if err := h.Comment.AdminDelete(uint(id)); err != nil {
 		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
 		return
 	}
-	c.JSON(http.StatusOK, gin.H{"message": "评论已删除"})
+	c.JSON(http.StatusOK, gin.H{"message": "评论已移入回收站"})
+}
+
+// APIAdminTrashComments 评论回收站列表
+func (h *Handlers) APIAdminTrashComments(c *gin.Context) {
+	page, _ := strconv.Atoi(c.DefaultQuery("page", "1"))
+	size, _ := strconv.Atoi(c.DefaultQuery("size", "20"))
+	keyword := strings.TrimSpace(c.Query("keyword"))
+	comments, total, err := h.Comment.ListTrash(page, size, keyword)
+	if err != nil {
+		c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
+		return
+	}
+	if comments == nil {
+		comments = []service.TrashCommentItem{}
+	}
+	c.JSON(http.StatusOK, gin.H{
+		"comments": comments, "total": total, "page": page,
+		"total_pages": calcTotalPages(total, size),
+	})
+}
+
+// APIAdminRestoreComment 从回收站恢复评论
+func (h *Handlers) APIAdminRestoreComment(c *gin.Context) {
+	id, _ := strconv.ParseUint(c.Param("id"), 10, 64)
+	if err := h.Comment.Restore(uint(id)); err != nil {
+		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
+		return
+	}
+	c.JSON(http.StatusOK, gin.H{"message": "评论已恢复"})
+}
+
+// APIAdminPurgeComment 永久删除回收站评论
+func (h *Handlers) APIAdminPurgeComment(c *gin.Context) {
+	id, _ := strconv.ParseUint(c.Param("id"), 10, 64)
+	if err := h.Comment.Purge(uint(id)); err != nil {
+		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
+		return
+	}
+	c.JSON(http.StatusOK, gin.H{"message": "评论已永久删除"})
 }
 
 // APIAdminCommentRevisions 管理员查看评论编辑历史

handler/handlers.go

@@ -484,7 +484,7 @@ func (h *Handlers) APIDeleteComment(c *gin.Context) {
 		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
 		return
 	}
-	c.JSON(http.StatusOK, gin.H{"message": "评论已删除"})
+	c.JSON(http.StatusOK, gin.H{"message": "评论已移入回收站"})
 }
 
 func (h *Handlers) APIUpdateComment(c *gin.Context) {

router/router.go

@@ -204,9 +204,12 @@ func Setup(cfg *config.Config) (*gin.Engine, error) {
 		adminAPI.GET("/reports", h.APIAdminReports)
 		adminAPI.POST("/reports/:id/handle", h.APIAdminHandleReport)
 		adminAPI.GET("/comments", h.APIAdminComments)
+		adminAPI.GET("/comments/trash", h.APIAdminTrashComments)
 		adminAPI.GET("/comments/:id/revisions", h.APIAdminCommentRevisions)
 		adminAPI.POST("/comments/:id/approve", h.APIAdminApproveComment)
 		adminAPI.POST("/comments/:id/reject", h.APIAdminRejectComment)
+		adminAPI.POST("/comments/:id/restore", h.APIAdminRestoreComment)
+		adminAPI.DELETE("/comments/:id/purge", h.APIAdminPurgeComment)
 		adminAPI.DELETE("/comments/:id", h.APIAdminDeleteComment)
 		adminAPI.GET("/users", h.APIAdminUsers)
 		adminAPI.POST("/users/:id/ban", h.APIAdminBanUser)

service/comment.go

@@ -395,12 +395,137 @@ func (s *CommentService) Update(userID, commentID uint, isAdmin, skipModeration
 	return content, enteredPending, nil
 }
 
+// collectReplySubtreeIDs 沿 reply_to BFS 收集子树 ID（含 rootID）
+// softDeletedOnly 为 true 时仅收集已软删节点（用于回收站恢复/永久删除）
+func collectReplySubtreeIDs(db *gorm.DB, rootID uint, softDeletedOnly bool) ([]uint, error) {
+	q := db
+	if softDeletedOnly {
+		q = db.Unscoped()
+	}
+	ids := []uint{rootID}
+	seen := map[uint]struct{}{rootID: {}}
+	frontier := []uint{rootID}
+	for len(frontier) > 0 {
+		childQ := q.Model(&model.Comment{}).Select("id").Where("reply_to IN ?", frontier)
+		if softDeletedOnly {
+			childQ = childQ.Where("deleted_at IS NOT NULL")
+		}
+		var children []model.Comment
+		if err := childQ.Find(&children).Error; err != nil {
+			return nil, err
+		}
+		frontier = frontier[:0]
+		for _, c := range children {
+			if _, ok := seen[c.ID]; ok {
+				continue
+			}
+			seen[c.ID] = struct{}{}
+			ids = append(ids, c.ID)
+			frontier = append(frontier, c.ID)
+		}
+	}
+	return ids, nil
+}
+
+// AdminDelete 软删除评论及其回复树（进入回收站）；修订与点赞保留以便恢复
 func (s *CommentService) AdminDelete(commentID uint) error {
-	return model.DB.Transaction(func(tx *gorm.DB) error {
+	var root model.Comment
-		if err := tx.Where("comment_id = ?", commentID).Delete(&model.CommentRevision{}).Error; err != nil {
+	if err := model.DB.First(&root, commentID).Error; err != nil {
+		return ErrCommentNotFound
+	}
+	ids, err := collectReplySubtreeIDs(model.DB, commentID, false)
+	if err != nil {
 		return err
 	}
-		return tx.Delete(&model.Comment{}, commentID).Error
+	return model.DB.Where("id IN ?", ids).Delete(&model.Comment{}).Error
+}
+
+// TrashCommentItem 评论回收站列表项
+type TrashCommentItem struct {
+	model.Comment
+	DeletedAt time.Time `json:"deleted_at"`
+}
+
+// ListTrash 列出已软删评论（不含随帖子一并删除的评论，那些在帖子回收站处理）
+func (s *CommentService) ListTrash(page, size int, keyword string) ([]TrashCommentItem, int64, error) {
+	if page < 1 {
+		page = 1
+	}
+	size = s.settings.NormalizePageSize(size)
+	db := model.DB.Unscoped().Model(&model.Comment{}).
+		Where("comments.deleted_at IS NOT NULL").
+		Joins("JOIN posts ON posts.id = comments.post_id AND posts.deleted_at IS NULL").
+		Preload("User").Preload("Post")
+	if keyword != "" {
+		kw, err := s.settings.NormalizeSearchKeyword(keyword)
+		if err != nil {
+			return nil, 0, err
+		}
+		like := "%" + kw + "%"
+		db = db.Where("comments.content LIKE ? OR posts.title LIKE ?", like, like)
+	}
+	var total int64
+	if err := db.Count(&total).Error; err != nil {
+		return nil, 0, err
+	}
+	var comments []model.Comment
+	if err := db.Order("comments.deleted_at DESC").Offset((page - 1) * size).Limit(size).Find(&comments).Error; err != nil {
+		return nil, 0, err
+	}
+	out := make([]TrashCommentItem, len(comments))
+	for i, c := range comments {
+		out[i] = TrashCommentItem{Comment: c}
+		if c.DeletedAt.Valid {
+			out[i].DeletedAt = c.DeletedAt.Time
+		}
+	}
+	return out, total, nil
+}
+
+// Restore 从回收站恢复评论及其已软删的回复树
+func (s *CommentService) Restore(commentID uint) error {
+	var comment model.Comment
+	if err := model.DB.Unscoped().First(&comment, commentID).Error; err != nil {
+		return ErrCommentNotFound
+	}
+	if !comment.DeletedAt.Valid {
+		return errors.New("评论未被删除")
+	}
+	// 所属帖子必须仍存在且未删除
+	var post model.Post
+	if err := model.DB.First(&post, comment.PostID).Error; err != nil {
+		return errors.New("所属帖子不存在或已在回收站，请先恢复帖子")
+	}
+	ids, err := collectReplySubtreeIDs(model.DB, commentID, true)
+	if err != nil {
+		return err
+	}
+	return model.DB.Unscoped().Model(&model.Comment{}).
+		Where("id IN ?", ids).
+		Update("deleted_at", nil).Error
+}
+
+// Purge 永久删除回收站中的评论及其已软删回复（含修订、点赞）
+func (s *CommentService) Purge(commentID uint) error {
+	var comment model.Comment
+	if err := model.DB.Unscoped().First(&comment, commentID).Error; err != nil {
+		return ErrCommentNotFound
+	}
+	if !comment.DeletedAt.Valid {
+		return errors.New("仅可彻底删除回收站中的评论，请先删除评论")
+	}
+	ids, err := collectReplySubtreeIDs(model.DB, commentID, true)
+	if err != nil {
+		return err
+	}
+	return model.DB.Transaction(func(tx *gorm.DB) error {
+		if err := tx.Where("comment_id IN ?", ids).Delete(&model.CommentRevision{}).Error; err != nil {
+			return err
+		}
+		if err := tx.Where("comment_id IN ?", ids).Delete(&model.CommentLike{}).Error; err != nil {
+			return err
+		}
+		return tx.Unscoped().Where("id IN ?", ids).Delete(&model.Comment{}).Error
 	})
 }